JP6444234B2 - Catheter assembly - Google Patents

Description

  The present invention relates to a catheter assembly that punctures and indwells a blood vessel when, for example, infusion is performed on a patient.

  Conventionally, for example, a catheter assembly is used when infusion or the like is performed on a patient. This type of catheter assembly includes a hollow catheter, a catheter hub fixed to the proximal end of the catheter, a hollow inner needle that is inserted into the catheter and has a sharp needle tip, and a proximal end of the inner needle. And a needle hub fixed to the head. Further, for example, as in Patent Document 1 below, in the catheter assembly, in order to facilitate insertion of the catheter into the blood vessel, the catheter is slidably inserted in the lumen of the inner needle and protrudes from the tip of the inner needle. Some have a possible guidewire.

Special table 2013-529111 gazette

  The catheter assembly of Patent Document 1 includes a safety member that covers the distal end of the inner needle when the inner needle is removed from the catheter. However, in the catheter assembly of Patent Document 1, the distal end of the guide wire protrudes from the distal end of the inner needle when the inner needle is removed from the catheter. For this reason, even when the tip of the inner needle is protected by the safety member, the blood adhering to the guide wire may be scattered because the tip of the guide wire protrudes from the safety member. Moreover, if it is going to protect the front-end | tip of a guide wire with a safety member, it will be necessary to lengthen the full length of a safety member. As a result, the total length of the product becomes long, making it difficult for the user to use.

  The present invention has been made in consideration of such problems, and an object thereof is to provide a catheter assembly that can prevent blood adhering to a guide wire from scattering.

  In order to achieve the above object, a catheter assembly according to the present invention includes a catheter, a catheter hub that fixes and holds the catheter, and a needle tip that is removably inserted into the catheter. An inner needle, a needle hub that fixes and holds the inner needle, a guide wire that is inserted into the inner needle, can move relative to the inner needle and protrude from the needle tip, and a relative relationship between the guide wire A guide wire operating member for operating movement and an advancing operation relative to the needle hub as the catheter hub advances, and based on this advancing operation, the distal end of the guide wire is proximal to the needle tip And a retractable member that is moved to the position.

  According to the above, when the catheter assembly has the retracting member, the distal end of the guide wire is automatically retracted to the proximal side from the needle tip of the inner needle when the inner needle is removed from the catheter. be able to. That is, the catheter assembly can retract the tip of the guide wire into the inner needle by projecting the guide wire from the needle tip and then moving the retracting member with the catheter hub. Thereby, the catheter assembly can prevent the blood adhering to the guide wire from being scattered, and can properly handle (dispose of) the device after puncture.

  In this case, the retractable member is provided with a movable side guide portion in which the guide wire is movably disposed, and the inner needle or the needle hub is movably disposed in the fixed side guide. It is preferable that the guide wire is retracted in the inner needle when the movable guide portion and the guide wire are relatively displaced as the retracting member moves forward.

  Thus, by providing the movable side guide portion on the retracting member and providing the fixed side guide portion on the inner needle or the needle hub, the guide wire operates when the movable side guide portion advances based on the advancement operation of the retracting member. become. At this time, the distal end of the guide wire opposite to the proximal end fixed to the guide wire operating member slides in the inner needle, and the distal end of the guide wire can be easily drawn into the inner needle.

  In addition to the above configuration, the movable guide portion and the fixed guide portion may be a passage through which a guide wire can be inserted.

  Thus, by configuring the movable side guide portion and the fixed side guide portion with a passage through which the guide wire can be inserted, the guide wire can be slid while changing the shape of the guide wire so as not to be excessive in the passage. Can do. Therefore, the guide wire can be projected and retracted satisfactorily.

  Further, the passage of the movable side guide portion may have an inlet port and an outlet port, and both the inlet port and the outlet port may face the proximal direction.

  As described above, since both the inlet port and the outlet port face the proximal end direction, the guide wire can be smoothly guided to the fixed-side guide portion or the inner needle. Moreover, the movable side guide part formed as a channel | path can bend a guide wire inside smoothly.

  Furthermore, it is preferable that the movable side guide part and the fixed side guide part have ports that face each other and extend linearly along the moving direction of the retracting member.

  As a result, the movable side guide portion and the fixed side guide portion communicate linearly in the vicinity of each port, smoothly pass the guide wire, and slide the guide wire well during the retracting operation of the retracting member. be able to.

  Further, the fixed side guide portion includes a first fixed side guide portion and a second fixed side guide portion which are independent from each other, and the guide wire protrudes from the guide wire operating member, and the first fixed side guide portion It is preferable that the first guide portion, the movable guide portion, and the second fixed guide portion are inserted in this order and inserted into the inner needle.

  In this way, the guide wire is inserted into the inner needle through the first fixed side guide portion, the movable side guide portion, and the second fixed side guide portion in this order, so that the retracting member is relatively positioned relative to the needle hub. When the advancing operation is performed, the distance between the fixed side guide portion and the movable side guide portion increases. As a result, the guide wire can be drawn more smoothly.

  Furthermore, the guide wire protrudes from the guide wire operating member and has a high rigidity portion with increased rigidity over a predetermined range, and a low rigidity portion that extends from the high rigidity portion and has a lower rigidity than the high rigidity portion, and It is good to include.

  As described above, since the guide wire has the high rigidity portion, the rigidity of the proximal end side of the protruding portion of the guide wire is increased, and the advancement output of the guide wire by the guide wire operation member can be reliably transmitted to the low rigidity portion. . The low rigidity portion slides while deforming along the shape of the guide portion in the needle hub and the retracting member, and is advanced well from the needle tip of the inner needle.

  Here, it is preferable that the retracting member is advanced following the advancement of the catheter hub and constitutes at least a part of a protector that accommodates the inner needle therein.

  As a result, the catheter assembly can draw the guide wire from the tip of the inner needle using the protector provided in the conventional catheter assembly, and it is necessary to provide another structure as the drawing member in the catheter assembly. Disappear. Therefore, the structure of the catheter assembly can be simplified.

  In this case, the protector has a multi-layer structure in which a plurality of cylinders having different diameters are stacked when the inner needle and the catheter are punctured, and the plurality of cylinders advance the catheter hub with the advancement of the catheter hub. Preferably, the retracting member is one of the plurality of cylinders.

  Thus, since the retracting member is one of the plurality of cylinders of the protector, the guide wire can be easily pulled in by the cylinder moving relative to the needle hub.

  Still further, the guide wire operating member may be configured to project the guide wire from the needle tip in accordance with a relative movement operation with respect to the needle hub.

  As described above, if the guide wire is protruded from the needle tip in accordance with the movement operation of the guide wire operating member, the user sensibly operates the guide wire protruding from the needle tip when operating the guide wire operating member. And the procedure can be performed well.

  According to the present invention, the catheter assembly can prevent blood adhering to the guide wire from scattering.

It is a perspective view which shows the catheter assembly which concerns on 1st Embodiment of this invention. It is a perspective view which shows the state which protruded the guide wire in use of the catheter assembly of FIG. FIG. 3 is a perspective view showing a state where an inner needle is housed in a protector in the catheter assembly from which the guide wire of FIG. 2 is projected. FIG. 2 is an exploded perspective view of the catheter assembly of FIG. 1. FIG. 2 is a side cross-sectional perspective view of the catheter assembly of FIG. 1. It is an expansion perspective view of the 2nd relay cylinder of the catheter assembly of FIG. It is a cross-sectional perspective view which shows the movable side channel | path and fixed side channel | path of the catheter assembly of FIG. It is a cross-sectional perspective view which shows the operation | movement at the time of guide wire delivery of the catheter assembly of FIG. It is a cross-sectional perspective view which shows operation | movement of the guide wire at the time of advancement of the protector of the catheter assembly of FIG. It is a perspective view which shows the catheter assembly which concerns on 2nd Embodiment of this invention. FIG. 11 is an exploded perspective view of the catheter assembly of FIG. 10. FIG. 11 is a side cross-sectional view of the catheter assembly of FIG. 10. It is an expansion perspective view of the needle holding part of the catheter assembly of FIG. It is an expansion perspective view of the 2nd relay cylinder of the catheter assembly of FIG. It is a cross-sectional perspective view which shows the movable side channel | path and fixed side channel | path of the catheter assembly of FIG. FIG. 11 is a cross-sectional perspective view showing the operation of the catheter assembly of FIG. 10 during guide wire delivery. It is a cross-sectional perspective view which shows the operation | movement at the time of advancement of the protector of the catheter assembly of FIG.

  Hereinafter, preferred embodiments (first and second embodiments) of the catheter assembly according to the present invention will be described and described in detail with reference to the accompanying drawings.

[First Embodiment]
The catheter assembly 10 according to the first embodiment is an indwelling needle that is applied when transfusion, blood transfusion, or the like is performed on a patient (living body), and that is punctured and placed in the patient's body to serve as an introduction unit for a medical solution or the like. In particular, the catheter assembly 10 has a function of projecting a guide wire 20 through the inside of the inner needle 12 as shown in FIG. 1 for improving the workability of a user such as a doctor or nurse, and further resembles a syringe. It is formed in a different shape.

  The catheter assembly 10 can be configured as a peripheral venous catheter or a catheter (eg, central venous catheter, PICC, midline catheter, etc.) that is longer than the peripheral venous catheter. The catheter assembly 10 is not limited to a venous catheter, and may be configured as an arterial catheter such as a peripheral artery catheter.

  The catheter assembly 10 includes an inner needle 12, a housing 14 (needle hub), a catheter 16, a catheter hub 18, a guide wire 20, a guide wire operation member 22, and a protector 24 (retraction member).

  In the initial state before use, the catheter assembly 10 has the inner needle 12 and the catheter 16 overlapped with each other, and the guide wire 20 is inserted to the proximal end side of the needle tip 12a in the inner needle 12, and the catheter hub 18 is inserted. Protrudes from the tip of the. In addition, the housing 14 has a protector 24 that locks the catheter hub 18 inserted on the distal end side, and a guide wire operating member 22 inserted on the proximal end side. The inner needle 12 may be provided with a groove along the axial direction.

  When using the catheter assembly 10, the user grasps the housing 14 and punctures the inner needle 12 and the tip of the catheter 16 into the blood vessel (vein or artery) of the patient. Further, while maintaining this puncture state, the user advances the guide wire operating member 22 in the distal direction with respect to the housing 14 as shown in FIG. 2, thereby causing the guide wire 20 to protrude from the needle tip 12a. The guide wire 20 discharged from the needle tip 12a enters along the blood vessel.

  Thereafter, the user advances the catheter hub 18 relative to the housing 14 to further advance the catheter 16 further to the distal end side (that is, the inner part of the blood vessel) than the inner needle 12. At this time, the catheter 16 is inserted into the blood vessel along the guide wire 20 that has previously entered the blood vessel.

  When the advancement operation of the catheter hub 18 (or the retraction operation of the housing 14 relative to the catheter hub 18) is continued, the protector 24 holding the catheter hub 18 is extended as shown in FIG. Here, the catheter assembly 10 is configured to automatically retract the guide wire 20 protruding from the needle tip 12a and accommodate it in the inner needle 12 (that is, in the protector 24) when the catheter hub 18 is advanced. It has become.

  And the catheter assembly 10 accommodates the inner needle 12 because the advancement operation continues and the protector 24 becomes sufficiently long in the axial direction. As a result, the protector 24 prevents the inner needle 12 from being exposed to the outside, and prevents false puncture, blood contamination, and the like. Further, the protector 24 releases the holding of the catheter hub 18 to place the catheter 16 and the catheter hub 18 on the patient. Hereinafter, the catheter assembly 10 will be specifically described.

  As shown in FIGS. 1 and 4, the inner needle 12 of the catheter assembly 10 is configured as a hollow tubular body having rigidity capable of puncturing the patient's skin. A sharp needle tip 12 a is formed at the tip of the inner needle 12. A through hole 28 is provided in the inner needle 12 along the axial direction. The through hole 28 has a distal end opening 28 a provided in the needle tip 12 a and a proximal end provided at the proximal end of the inner needle 12. It communicates with the opening 28b (see FIG. 5). The inner needle 12 may be provided with a groove portion in the axial direction.

  The proximal end of the inner needle 12 is firmly fixed to the housing 14 by an appropriate fixing method (fusion, adhesion, insert molding, etc.). Examples of the constituent material of the inner needle 12 include stainless steel, aluminum or aluminum alloy, metal material such as titanium or titanium alloy, hard resin, ceramics, and the like. In the present embodiment, the proximal end of the inner needle 12 is directly connected to the housing 14, but may be connected via another member such as a needle holding member.

  The housing 14 is formed in a cylindrical shape having a thickness and a length that can be easily gripped by the user. In addition, although the housing 14 is formed in the square cylinder of a cross-sectional rectangular shape in this embodiment, it is not limited to this, For example, you may form in a cylinder. A hook 30 is provided on the outer peripheral surface of the base end side of the housing 14 for the user to put his / her finger on.

  The housing 14 has an internal space that accommodates each member of the catheter assembly 10 in an assembled state, and a solid portion 32 (see FIG. 5) is provided at an intermediate portion in the axial direction. It is divided into a distal end side space 34 and a proximal end side space 36 with the portion 32 interposed therebetween. The distal end side space 34 and the proximal end side space 36 are formed in a rectangular shape with rounded corners in a cross-sectional view according to the appearance of the housing 14.

  The distal end side space 34 communicates with the distal end opening 34 a of the housing 14 and accommodates the catheter hub 18 and a part of the protector 24. On the inner surface constituting the tip opening 34a, a housing-side inner convex portion 38 that restricts the detachment of the protector 24 is provided. The inner needle 12 is held at the central portion (axial center) of the solid portion 32 of the housing 14, extends along the axial direction of the housing 14, and projects outward from the tip opening 34 a. On the other hand, the proximal side space 36 communicates with a proximal end opening (not shown) of the housing 14 and partially accommodates the guide wire operating member 22.

  The housing 14 is preferably made of a relatively hard material so that the user can easily operate it. The constituent material of the housing 14 is not particularly limited. For example, a thermoplastic resin such as polypropylene, polycarbonate, polyamide, polysulfone, polyarylate, and methacrylate-butylene-styrene copolymer may be preferably used.

  The catheter 16 of the catheter assembly 10 is formed into a tube body that is more flexible than the inner needle 12. Inside the catheter 16, an inner needle 12 is accommodated, and a lumen 40 through which a drug solution, blood, or the like can flow is formed so as to penetrate along the axial direction. The catheter 16 is formed in a short type as described above. In this case, the protruding length from the catheter hub 18 is set to be less than 3 inches (or 7.62 cm). The catheter 16 is not limited to the short type, and may be formed as a longer catheter.

  The constituent material of the catheter 16 is not particularly limited, but a soft resin material is suitable, for example, polytetrafluoroethylene (PTFE), ethylene-tetrafluoroethylene copolymer (ETFE), perfluoroalkoxy fluororesin. Fluorine resins such as (PFA), olefin resins such as polyethylene and polypropylene, or a mixture thereof, polyurethane, polyester, polyamide, polyether nylon resin, a mixture of the olefin resin and an ethylene / vinyl acetate copolymer, etc. can give.

  The proximal end portion of the catheter 16 is fixed to the distal end portion in the catheter hub 18 by an appropriate fixing method (caulking, fusing, bonding, etc.). The catheter hub 18 is exposed on the patient's skin in a state where the catheter 16 is inserted into the blood vessel, and is affixed with a tape or the like and placed with the catheter 16.

  The catheter hub 18 is made of a material harder than the catheter 16 and is formed in a cylindrical shape tapered in the distal direction. The catheter hub 18 may be configured by appropriately adopting, for example, the materials raised in the housing 14. An infusion tube connector (not shown) is connected to the proximal end side of the catheter hub 18.

  As shown in FIGS. 4 and 5, the catheter hub 18 is provided with a hollow portion 18 a that communicates with the lumen 16 a of the catheter 16 and allows the infusion agent to flow therethrough. The hollow portion 18a may contain a hemostasis valve, a plug, etc. (not shown) that prevent backflow of blood when the inner needle 12 is punctured and enables infusion with insertion of a connector of an infusion tube. Further, a ring-shaped flange portion 44 projects from the outer peripheral surface of the proximal end side of the catheter hub 18.

  The protector 24 has a plurality (four in the present embodiment) of cylinders, and in an initial state, the cylinders are coaxially overlapped to form a shortened state (multiple structure) and accommodated in the distal end side space 34 of the housing 14. Is done. In this state, the distal end portion of the protector 24 locks the catheter hub 18. When the inner needle 12 is removed (extracted) from the catheter 16, each cylindrical body extends and expands stepwise in a stepwise manner, accommodates the inner needle 12 therein (see also FIG. 3), and the protector 24. The distal end of the catheter unlocks the catheter hub 18. Hereinafter, in order from the cylindrical body located at the tip during extension, the inner cylinder 46, the outer cylinder 48, the first relay cylinder 50, and the second relay cylinder 52 are referred to.

  The inner cylinder 46 of the protector 24 includes a block accommodating portion 54 in which a cavity portion 64 is formed, a block member 66 that is movably accommodated in the cavity portion 64, and a head that protrudes short from the block accommodating portion 54 in the distal direction. 60, a pair of engaging arms 62 protruding in the distal direction from both side surfaces of the block housing portion 54 and elastically deformable, and a first extending cylinder portion 56 projecting in the proximal direction from the block housing portion 54.

  In the initial state, the block member 66 is disposed on the lower side of the cavity portion 64 with the displacement in the upward direction restricted by the inner needle 12 passing through the cavity portion 64, and provided on the block member 66 and the outer cylinder 48. The inner cylinder 46 is prevented from moving in the distal direction relative to the outer cylinder 48 under the action of contact with an inclined guide surface (not shown). When the distal end of the inner needle 12 moves to the proximal end side with respect to the block member 66 as the inner needle 12 is removed from the catheter 16, the block member 66 can be lifted so that the inner cylinder 46 is moved relative to the outer cylinder 48. Relative movement is possible in the tip direction. When the inner cylinder 46 advances relative to the outer cylinder 48, the block member 66 is guided by the guide surface of the outer cylinder 48, moves upward, and is locked at an appropriate height. The block member 66 is opposed to the needle tip 12a accommodated in the first extending cylindrical portion 56 at the locking position, thereby preventing the inner needle 12 from being exposed from the tip of the protector 24.

  The head 60 is detachably inserted and fitted into the hollow portion 18 a of the catheter hub 18. Further, the pair of engaging arms 62 are housed in the distal end portion (the distal end case portion 72 described later) of the outer cylinder 48 in a state where the distal ends engage with the flange portion 44 of the catheter hub 18 and are prevented from opening. ing. When the inner cylinder 46 moves relative to the outer cylinder 48 in the distal direction, the engagement arm 62 protrudes from the distal end portion of the outer cylinder 48 and opens, whereby the engagement of the engagement arm 62 with the catheter hub 18 is released. The protector 24 including the inner tube 46 can be detached from the catheter hub 18.

  The first extending cylinder part 56 has an inner cylinder side accommodation space 56 a that is formed so as to penetrate the inner needle 12 so as to be slidable and communicates with the cavity part 64. In addition, a protrusion 70 to be inserted into the long hole 74 b of the outer cylinder 48 is provided on the upper portion of the first extending cylinder portion 56.

  The outer cylinder 48 has a distal end side distal end case portion 72 formed in a box shape with the distal end and the upper portion opened, and a second extending cylindrical portion 74 extending from the distal end case portion 72 in the proximal direction. The tip case portion 72 accommodates the block accommodating portion 54 of the inner cylinder 46, the pair of engaging arms 62, and the block member 66 in the initial state.

  The second extending cylinder part 74 has an outer cylinder side accommodation space 74 a that is formed so as to slidably accommodate the first extension cylinder part 56 and communicates with the space of the tip case part 72. On the proximal end side outer peripheral surface of the second extending cylinder part 74, an outer cylinder side outer convex part 78 is formed so as to protrude outward. In addition, a long hole 74 b that communicates with the outer cylinder side accommodation space 74 a is formed in the upper portion of the second extending cylinder portion 74. The long hole 74 b is provided with the projection 70 of the first extending cylinder portion 56 to prevent the outer cylinder 48 from coming off when the inner cylinder 46 is advanced.

  The first relay cylinder 50 includes a first relay cylinder-side accommodation space 50a formed so as to penetrate the second extension cylinder portion 74 so as to be slidable. A ring-shaped first relay cylinder side inner convex portion 80 is formed to project inward from the inner peripheral surface of the distal end side of the first relay cylinder side accommodation space 50a. When the outer cylinder 48 advances relative to the first relay cylinder 50 at the time of detachment, the first relay cylinder-side inner convex part 80 hooks the outer cylinder-side outer convex part 78 to prevent it from coming off. In addition, a first relay cylinder side outer convex portion 82 is formed on the outer peripheral surface of the proximal end side of the first relay cylinder 50 so as to protrude outward.

  The second relay cylinder 52 includes a second relay cylinder-side storage space 52a formed so as to penetrate the first relay cylinder 50 so as to be slidable. A ring-shaped second relay cylinder side convex portion 84 is formed to project inward from the inner peripheral surface of the distal end side of the second relay cylinder side accommodation space 52a of the second relay cylinder 52. When the first relay cylinder 50 advances relative to the second relay cylinder 52 when detached, the second relay cylinder side inner convex portion 84 hooks the first relay cylinder side outer convex portion 82 to prevent it from coming off. .

  Further, as shown in FIGS. 4 and 6, a pair of ear portions 86 are integrally formed on the outer peripheral surface on the proximal end side of the second relay cylinder 52. The pair of ears 86 are arc-shaped blocks that protrude outward in the width direction of the second relay cylinder 52 and extend on the outer peripheral surface of the second relay cylinder 52 by a predetermined length along the circumferential direction. The pair of ears 86 are caught by the housing-side inner convex portion 38 of the housing 14 when the second relay cylinder 52 advances relative to the housing 14 at the time of separation. Thereby, the second relay cylinder 52 (that is, the protector 24) is prevented from coming off from the housing 14.

  Further, one of the pair of ear portions 86 has a movable side passage 88 (movable side guide portion) through which the guide wire 20 inserted into the housing 14 is passed. The movable side passage 88 is formed to have a diameter slightly larger than the outer diameter (small diameter portion 20b) of the guide wire 20, and the guide wire 20 is slidably disposed.

  This movable-side passage 88 is a path that communicates with two ports (an upper port 88a (inlet port) at the upper position and an intermediate port 88b (outlet port) at the intermediate position in the vertical direction) provided on the proximal end surface of the ear 86. Formed. That is, the movable side passage 88 extends linearly in the distal direction from the upper port 88a inside the ear portion 86, folds through a U-shaped movable side folded portion 88c at a predetermined position, and further in the proximal direction. It extends in a straight line and reaches the intermediate port 88b. The upper port 88 a and the intermediate port 88 b are opposed to the fixed side passage 90 formed in the solid portion 32 of the housing 14.

  That is, as shown in FIG. 7, the solid portion 32 of the housing 14 is also provided with a fixed-side passage 90 (fixed-side guide portion) through which the guide wire 20 is passed. In FIG. 7, in order to make the fixed side passage 90 easy to understand, a part (mainly the solid portion 32) of the housing 14 is shown spatially, and the fixed side passage 90 is shown in a cylindrical shape (hereinafter, FIG. 8). The same applies to FIG. 9). The fixed-side passage 90 includes a first fixed-side passage 92 extending linearly at a position facing the upper port 88a, and a second fixed-side passage 94 having one port at a position facing the intermediate port 88b. Divided into

  The first fixed-side passage 92 extends parallel to the axial direction of the housing 14 on the outer side in the width direction of the solid portion 32 in a plan sectional view. The first fixed-side passage 92 communicates with a proximal end port 92 a provided on the proximal end surface of the solid portion 32 and a distal end port 92 b provided on the distal end surface of the solid portion 32. Most of the first fixed side passage 92 from the proximal end port 92a to the vicinity of the distal end in the solid portion 32 is formed in a thick hole 93a having a thick diameter. A small portion from the large hole 93a to the distal end port 92b is formed as a small-diameter hole 93b having a diameter smaller than that of the large hole 93a. The pore 93 b has the same diameter as the movable side passage 88.

  The second fixed-side passage 94 is provided in an intermediate portion in the vertical direction of the solid portion 32. The second fixed side passage 94 communicates with a lateral port 94 a provided at a position facing the intermediate side port 88 b of the movable side passage 88 on the front end surface of the solid portion 32. The second fixed-side passage 94 extends linearly from the lateral port 94a in the proximal direction, and is folded back at a predetermined position through the U-shaped fixed-side folded portion 94b. The end of the folded portion is a solid portion. 32 axial centers. As described above, the proximal end of the inner needle 12 is inserted and held in the axial center portion of the solid portion 32. That is, the second fixed side passage 94 is formed in a path from the lateral port 94 a to the proximal end opening 28 b of the through hole 28 of the inner needle 12.

  The guide wire 20 passed through the movable side passage 88 and the fixed side passage 90 is fixedly held by the guide wire operating member 22 accommodated in the housing 14. The guide wire operating member 22 is formed in a shape imitating a pusher of a syringe corresponding to the shape of the housing 14. Specifically, a rod 96 that is formed in a square section with round corners and is long in the axial direction, and an operation plate 98 that protrudes radially outward from the base end side outer peripheral surface of the rod 96 are provided. The rod 96 does not block the base end side space 36 in an airtight manner (so-called no gasket), and is slidably inserted into the base end side space 36. The guide wire operating member 22 may be provided with an air passage for extracting air from the proximal end side space 36.

  As a constituent material of the guide wire operating member 22, the material raised in the housing 14 may be appropriately adopted. The distal end side of the rod 96 is formed in a solid shape, and the guide wire 20 is fixedly held by a wire fixing portion 96a formed in a hollow shape. The wire adhering portion 96a extends in a straight line and parallel to the axial direction of the rod 96 near a predetermined corner of the distal end surface of the rod 96, and the first fixed-side passage 92 (base end) is formed in the distal direction of the formation portion. Ports 92a) are arranged opposite.

  In the initial state, the guide wire 20 is located in the vicinity of the needle tip 12a of the inner needle 12 from the distal end surface of the guide wire operating member 22 through the appropriate path in the housing 14 (proximal to the needle tip 12a). Is set. Specifically, the guide wire 20 includes a proximal side space 36 of the housing 14, a first fixed side passage 92 of the solid portion 32, a movable side passage 88 of the protector 24, a second fixed side passage 94 of the solid portion 32, The inner needle 12 is inserted through the through hole 28 in this order. In other words, the guide wire 20 is inserted into the through-hole 28 via an S-shaped path that is folded back three-dimensionally.

  Further, the guide wire 20 has two parts (a large diameter part 20a and a small diameter part 20b) having different outer diameters. The large-diameter portion 20 a is provided in a predetermined range on the proximal end side that protrudes from the wire fixing portion 96 a and the guide wire operating member 22. The total length of the large diameter portion 20a is set according to the operation distance of the guide wire operation member 22 (corresponding to the large hole 93a of the housing 14), and is sufficiently shorter than the small diameter portion 20b. The large-diameter portion 20a is a high-rigidity portion with increased rigidity on the proximal end side of the guide wire 20, and the guide wire 20 extends linearly from the guide wire operating member 22 so that the guide wire 20 is advanced. Is reliably transmitted to the guide wire 20.

  On the other hand, the small diameter portion 20b is formed to be thinner than the large diameter portion 20a, and continues to the leading edge of the large diameter portion 20a. The small-diameter portion 20b is a low-rigidity portion having a lower rigidity than the large-diameter portion 20a, and is thus satisfactorily inserted into the S-shaped path and the blood vessel described above.

  The catheter assembly 10 according to the present embodiment is basically configured as described above, and the operation and effect thereof will be described below.

  As described above, the catheter assembly 10 is used when constructing an infusion part for an infusion to a patient. In the initial state, as shown in FIG. 1, the protector 24 is accommodated in the distal end side space 34 of the housing 14, and the protector 24 locks the catheter hub 18. The inner needle 12 exposes the needle tip 12 a through the protector 24, the catheter hub 18, and the lumen 40 of the catheter 16 in the housing 14.

  More specifically, the catheter hub 18 is attached to the head portion 60 of the inner cylinder 46, and the pair of engaging arms 62 pressed against the distal case portion 72 of the outer cylinder 48 hooks the flange portion 44 of the catheter hub 18. Are locked. Further, as shown in FIG. 5, the protector 24 includes a first extending tube portion 56 of the inner tube 46, a second extending tube portion 74 of the outer tube 48, the first relay tube 50, and the second relay tube 52 overlapping. The base end of each cylinder is in contact with (or close to) the front end surface of the solid portion 32 of the housing 14.

  Therefore, as shown in FIG. 7, in the housing 14, the upper port 88 a of the movable side passage 88 and the tip port 92 b of the first fixed side passage 92 are in contact (or close to each other). Further, the intermediate side port 88b of the movable side passage 88 and the lateral side port 94a of the second fixed side passage 94 are also in contact (or close proximity). Therefore, the guide wire 20 protruding from the guide wire operating member 22 passes through the proximal end side space 36 and is sequentially inserted into the first fixed side passage 92, the movable side passage 88, and the second fixed side passage 94. Further, the guide wire 20 is inserted into the through hole 28 of the inner needle 12 from the second fixed side passage 94, and the distal end thereof is positioned near the proximal end side of the needle tip 12a of the inner needle 12 (see also FIG. 1). .

  Further, the guide wire operating member 22 is arranged with a space from the base end face of the solid portion 32 in the base end direction. In the initial state, the large-diameter portion 20 a of the guide wire 20 is slightly inserted into the first fixed side passage 92 through the proximal end side space 36. On the other hand, the small-diameter portion 20 b of the guide wire 20 is inserted into each passage of the solid portion 32 and the ear portion 86 of the protector 24.

  In using the catheter assembly 10, the user grasps the housing 14 and punctures the inner needle 12 and the tip of the catheter 16 from the patient's body surface into the blood vessel. In this puncture state, the user advances the guide wire operating member 22 in the distal direction relative to the housing 14. By this operation, as shown in FIG. 8, the distal end surface of the guide wire operating member 22 advances toward the solid portion 32 in the proximal end side space 36. At this time, the large-diameter portion 20a of the guide wire 20 advances linearly through the proximal end side space 36 and the first fixed side passage 92 without being bent. Therefore, the advance / output is smoothly transmitted to the small diameter portion 20b of the guide wire 20, and the small diameter portion 20b slides on the first fixed side passage 92, the movable side passage 88, the second fixed side passage 94, and the through hole 28. The tip is delivered from the needle tip 12a (see also FIG. 2).

  Here, the first fixed-side passage 92 and the movable-side passage 88 are linear in the axial direction around the boundary between the solid portion 32 and the ear portion 86 (a certain range of the tip port 92b and the upper port 88a facing each other). It extends to. Similarly, the movable-side passage 88 and the second fixed-side passage 94 are also linear in the vicinity of the boundary between the solid portion 32 and the ear portion 86 (a certain range of the intermediate-side port 88b and the lateral-side port 94a facing each other). It extends. As a result, the guide wire 20 extends straight at the boundary between the solid portion 32 and the ear portion 86, and between the first fixed side passage 92, the movable side passage 88, and the second fixed side passage 94. It can slide smoothly.

  After the guide wire 20 protrudes from the needle tip 12a, the user advances the catheter 16 and the catheter hub 18 relative to the housing 14 (including retracting the housing 14 in the proximal direction). As a result, the catheter 16 is inserted into the inner part of the blood vessel along the guide wire 20, and the protector 24 extends in the axial direction as the catheter hub 18 advances. When the protector 24 is extended, first, the second relay cylinder 52 with few contact points with the housing 14 starts to advance in the distal direction.

  As shown in FIG. 9, when the second relay cylinder 52 advances in the distal direction, the catheter assembly 10 has a distance between the solid portion 32 and the ear portion 86 (that is, the fixed side passage 90 and the movable side passage 88). The guide wire 20 reciprocates in the forward and proximal directions. In this case, since the proximal end portion of the guide wire 20 is fixed to the guide wire operating member 22, the distal end in a free state moves in the through hole 28 in the proximal direction. That is, the guide wire 20 passes through the first fixed side passage 92, the movable side passage 88, and the second fixed side passage 94 in this order, so that the guide wire 20 moves toward the second fixed side passage 94 as the protector 24 advances. And move easily. As a result, the distal end of the guide wire 20 is retracted to the proximal end side with respect to the needle tip 12a of the inner needle 12 and is not exposed.

  As shown in FIG. 3, as the catheter assembly 10 continues the advancement operation of the protector 24, the inner cylinder 46, the outer cylinder 48, the first relay cylinder 50, and the second relay cylinder 52 advance in the distal direction, The needle 12 is accommodated in the protector 24. At this time, as the inner cylinder 46 advances in the distal direction relative to the outer cylinder 48, the pair of engagement arms 62 comes out of the distal case portion 72 to release the engagement of the catheter hub 18, and the protector 24 and the catheter hub 18 are released. To leave. When the inner cylinder 46 advances, the block member 66 moves upward in the hollow portion 64 and is locked at a position facing the needle tip 12a of the inner needle 12, thereby preventing the inner needle 12 from being exposed. At this time, since the guide wire 20 is retracted to the proximal end side with respect to the needle tip 12a, the block member 66 can be moved smoothly.

  As described above, the catheter assembly 10 according to the present embodiment moves the tip of the guide wire 20 to the inner side of the needle tip 12a of the inner needle 12 by the advance operation of the protector 24 when the inner needle 12 and the catheter 16 are detached. Can be retracted automatically. As a result, when the catheter assembly 10 removes the inner needle 12 from the patient, the guide wire 20 is in an unexposed state, preventing the blood adhering to the guide wire 20 from being scattered and handling the catheter assembly 10 ( (Disposal etc.) can be performed satisfactorily.

  In this case, the guide wire 20 is disposed so as to pass through the movable-side passage 88 and the fixed-side passage 90, so that the tip of the guide wire 20 can be easily drawn by the advancement operation of the protector 24. In addition, the catheter assembly 10 includes a movable guide portion and a fixed guide portion configured by a passage through which the guide wire 20 can be inserted, thereby changing the shape of the guide wire 20 so as not to be excessive in the passage. Meanwhile, the guide wire 20 can be slid. Therefore, the guide wire 20 can be projected and retracted satisfactorily. Further, since the movable side passage 88 and the fixed side passage 90 communicate linearly in the vicinity of each port, the guide wire 20 is smoothly passed, and the guide wire 20 is slid well when the protector 24 is advanced. Furthermore, in the catheter assembly 10, the rigidity of the proximal end side of the protruding portion of the guide wire 20 is increased because the guide wire 20 has the large diameter portion 20a. For this reason, the guide wire 20 can be satisfactorily advanced from the needle tip 12 a of the inner needle 12 by the advance operation by the guide wire operating member 22. In the present embodiment, the guide wire 20 is provided with the large-diameter portion 20a and the small-diameter portion 20b. However, the present invention is not limited to this, and any configuration having a high-rigidity portion and a low-rigidity portion may be used. The change in rigidity of the guide wire 20 can be realized by changing the cross-sectional shape, material, and the like, for example. It can also be realized by adding an additional reinforcing member or the like.

  Further, since the catheter assembly 10 retracts the guide wire 20 using the protector 24 provided in the conventional catheter assembly, it is not necessary to separately provide another structure as the retracting member in the catheter assembly 10. Therefore, the structure of the catheter assembly 10 can be simplified. In this case, the guide wire 20 can be easily pulled by the relative movement of the second relay cylinder 52 with respect to the housing 14 by passing the guide wire 20 through the second relay cylinder 52 having the largest diameter. In addition, since the second relay cylinder 52 is provided on the outermost side of the other cylinder bodies (the inner cylinder 46, the outer cylinder 48, and the first relay cylinder 50), the guide wire 20 is prevented from being entangled, and the protector 24 is made smooth. Can be stretched.

  Further, the catheter assembly 10 is configured such that the guide wire operating member 22 is inserted into the proximal end side of the housing 14 and the guide wire 20 protrudes from the needle tip 12a in accordance with the advance operation (moving operation). Thereby, the user can manipulate the protrusion of the guide wire 20 sensuously, and can perform the procedure well.

  Further, the above-described catheter assembly 10 is configured such that the protector 24 having the movable-side passage 88 moves relative to the housing 14, so that the guide wire 20 accommodated in the housing 14 operates appropriately. Can be made. That is, after the guide wire 20 protrudes from the needle tip 12a, the distal end of the guide wire 20 can be satisfactorily drawn into the inner needle 12 by relatively moving the movable passage 88. Thereby, the catheter assembly 10 can prevent scattering of blood adhering to the guide wire 20.

  The catheter assembly 10 according to the present invention is not limited to the above-described embodiment, and various application examples and modifications can be taken. For example, the guide wire 20 protruding from the guide wire operating member 22 is inserted first into the movable side passage 88 without passing through the fixed side passage 90, passes through the movable side passage 88, and then passes through the fixed side passage 90 to the inner needle. The twelve through holes 28 may be inserted. Further, the fixed guide portion may be provided not only in the housing 14 but also in the inner needle 12 itself. Furthermore, the movable side and fixed side guide portions are not limited to the passage, and may be, for example, a hook on which the guide wire 20 is slidably hooked. Furthermore, the retracting member may be constituted by a member that follows the advancement of the catheter hub 18 or the retraction of the housing 14, separately from the protector 24.

[Second Embodiment]
Next, the catheter assembly 110 according to the second embodiment of the present invention will be described. In the embodiment described later, the same reference numerals as those in the first embodiment are assumed to have the same configuration or the same function, and the detailed description thereof will be omitted below.

  As shown in FIGS. 10 and 11, the catheter assembly 110 is configured as an indwelling needle (so-called midline catheter) in which the entire length of the catheter 116 is relatively long. The length of the catheter 116 is set to about 20 to 500 mm, or about 30 to 400 mm, or about 100 to 300 mm, for example. Further, the catheter assembly 110 retracts the guide wire operating member 122 in the proximal direction to advance the guide wire 120 from the needle tip 112a of the inner needle 112, so that the catheter assembly 10 according to the first embodiment. And different.

  In this case, the catheter hub 118 of the catheter assembly 110 firmly holds the proximal end portion of the long catheter 116. A pair of connection pieces 118 a to which the catheter operating member 119 is rotatably attached are formed on the outer peripheral surface of the catheter hub 118.

  The catheter operation member 119 is attached to the upper side of the catheter hub 118 so that the user operates the catheter 116 and the catheter hub 118 to move forward and backward. The catheter operating member 119 has an axially extending body portion formed in a flat plate shape, and has a pair of connection projections 119a that can be attached to and detached from the pair of connection pieces 118a at the base end portion. 119b at the top of the tip.

  The housing 114 (needle hub) of the catheter assembly 110 covers the housing main body 130 having the internal space 130a, the needle holding portion 132 that holds the inner needle 112 and is disposed in the internal space 130a, and the upper side of the internal space 130a. And a lid 134. The inner space 130a accommodates the inner needle 112 and a part of the catheter 116, the catheter hub 118, the catheter operation member 119, the guide wire 120, the guide wire operation member 122, and the protector 124 in the initial state.

  The housing main body 130 has an elongated bowl shape formed by a lower wall 136, a rear wall 138, and a pair of side walls 140, and an internal space 130a is formed inside thereof. The front end side of the lower wall 136 is gently inclined upward toward the front end direction to shallow the internal space 130a. A guide groove (not shown) for guiding the relative movement of the protector 124 is provided on the upper surface of the lower wall 136.

  The rear wall 138 and the pair of side walls 140 protrude upward from the sides of the lower wall 136, and the upper sides are formed at the same height. Rails 142 for guiding the guide wire operating member 122 are provided on the inner side of the pair of side walls 140 and slightly ahead of the center in the front-rear direction. In an initial state, the catheter operation member 119 is disposed below the rail 142.

  A belt-like block 144 that protrudes inward in the width direction is continuously provided on one base end side of the pair of rails 142. The belt-like block 144 has a rectangular block 146 that extends a predetermined length along the axial direction of the housing main body 130 and that is widened downward on the base end side. Further, a first fixed-side passage 148 (one of the fixed-side passages 147: see FIG. 15) is provided inside the belt-like block 144.

  The first fixed-side passage 148 extends linearly from the distal end port 148a provided at the distal end of the belt-like block 144 toward the proximal direction, and is folded back in the distal end direction by the U-shaped fixed-side folded portion 148c in the rectangular block 146. ing. The folded portion of the first fixed-side passage 148 communicates with a proximal port 148b provided on the distal end surface of the rectangular block 146. As in the first embodiment, the first fixed-side passage 148 has a large hole 149a extending from the distal end port 148a over a predetermined range, and a pore 149b is connected to the proximal end side of the large hole 149a.

  On the other hand, the needle holding part 132 has an upright piece 150 and a horizontal piece 152 that protrudes in a direction orthogonal to the upright piece 150, and is formed in a T shape in a front view. As shown in FIG. 13, the needle holding portion 132 is fixed by inserting the proximal end portion of the inner needle 112 at the vertical center portion of the standing piece 150. The lower part of the standing piece 150 is fixed to the lower wall 136 of the housing body 130. On the other hand, a second fixed-side passage 154 that is fixed to the standing piece 150 and communicates with the through hole 128 of the inner needle 112 is provided inside the horizontal piece 152.

  The second fixed-side passage 154 communicates with a lateral port 154a formed on the distal end surface of the lateral piece 152, extends linearly from the lateral port 154a in the proximal direction, and is fixed in a U shape at a predetermined position. It is folded at the side folding portion 154b. The end portion of the folded portion of the second fixed side passage 154 reaches the inner needle 112 of the standing piece 150. A side hole 129 that continues to the through hole 128 is provided on the side wall of the inner needle 112, and the side hole 129 faces the second fixed side passage 154 so that the through hole 128 and the second fixed side passage are provided. 154 is communicated.

  In the catheter assembly 110, the protector 124 is disposed at the distal end position of the needle holding portion 132 in the initial state. The protector 124 includes an inner cylinder 156, a movable member 158, a first relay cylinder 160, and a second relay cylinder 162, and is formed in a telescope type that can expand and contract in the axial direction. In this case, the inner cylinder 156 and the movable member 158 have the same functions as the inner cylinder 46 and the block member 66 of the first embodiment, but the inner press in the width direction of the pair of engagement arms 62 is the housing main body 130. The side wall 140 is replaced. Therefore, there is no outer cylinder 48 of the first embodiment, the first relay cylinder 160 is configured in the same manner as the first relay cylinder 50 of the first embodiment, and the second relay cylinder 162 is the second relay cylinder of the first embodiment. The same as 52.

  As shown in FIG. 14, the second relay cylinder 162 has a relay cylinder side accommodation space 162 a for accommodating the first relay cylinder 160. On the outer peripheral surface of the second relay cylinder 162, a plurality of guide protrusions 164a and 164b are formed to protrude outward in the vertical direction, and a pair of extending protrusions 166 are formed to protrude outward in the width direction. The upper pair of guide protrusions 164 a are guided by protrusions (not shown) formed on the lower surface of the lid body 134. The pair of lower guide protrusions 164b are inserted and guided in guide grooves (not shown) of the housing main body 130, and when the second relay cylinder 162 advances relative to the housing 114, the guide protrusions 164b collide with the leading edges of the guide grooves. The second relay cylinder 162 is prevented from coming off from 114.

  The pair of extending protrusions 166 extend along the axial direction of the second relay cylinder 162, and include a rectangular portion 168 that is wide in the upward direction on the tip side. One of the pair of extending protrusions 166 is provided with a movable side passage 170 (the other of the fixed side passage 147).

  The movable side passage 170 includes an upper port 170a formed on the base end surface of the rectangular portion 168 and an intermediate port 170b formed on the base end surface of the extending protrusion 166 extending to the base end of the second relay cylinder 162. They communicate with each other. Specifically, the movable-side passage 170 slightly extends linearly from the upper port 170a toward the distal end, is folded by a U-shaped folded portion 170c at a predetermined position, and further extends linearly toward the proximal direction. The intermediate port 170b is reached. The diameter of the movable side passage 170 is equal to the diameter of the pore 149 b of the first fixed side passage 148.

  In the initial state, the catheter assembly 110 has the second relay tube 162 disposed on the proximal end side of the internal space 130a of the housing 114, so that the guide wire 120 is not exposed and is inserted into the through hole 28 of the inner needle 112. It forms a guiding path. That is, in the initial state, the rectangular block 146 of the belt-like block 144 and the rectangular portion 168 of the extending protrusion 166 are in contact with each other, so that the proximal port 148b of the first fixed side passage 148 and the upper port 170a of the movable side passage 170 are. Are communicating. In addition, the extension protrusion 166 of the second relay cylinder 162 and the needle holding portion 132 are in contact with each other, so that the intermediate port 170b of the movable passage 170 and the lateral port 154a of the second fixed passage 154 communicate with each other. Yes. In the vicinity of each boundary between the strip-shaped block 144 and the extending projection 166, and between the extending projection 166 and the strip-shaped block 144, the fixed-side passage 147 and the movable-side passage 170 extend linearly in the moving direction of the catheter hub 118. Thereby, sliding of the guide wire 120 is smoothed.

  Returning to FIGS. 10 and 11, the guide wire operation member 122 is disposed on the upper surface of the catheter operation member 119 in the initial state. The guide wire operation member 122 has an operation plate portion 172 placed on the catheter operation member 119 on the distal end side, and a pair of extending portions 174 extending in the proximal direction are connected to the operation plate portion 172. . Further, an operation protrusion 122 a for operating the guide wire operation member 122 is formed to protrude from the tip of the operation plate portion 172.

  One of the pair of extending portions 174 has a linear wire fixing portion 174a in the axial direction of the extending portion 174, and the wire fixing portion 174a inserts and fixes the guide wire 120 therein. In an initial state, the guide wire 120 extends from the proximal end of the extending portion 174 in the proximal direction and is inserted into the first fixed-side passage 148. This guide wire 120 has a large diameter portion 120a and a small diameter portion 120b, as in the first embodiment. The guide wire 120 is passed through the first fixed side passage 148, the movable side passage 170, and the second fixed side passage 154 in this order, and from the second fixed side passage 154 through the side hole 129 of the inner needle 112, the through hole 128. It is inserted in and extends to the proximal end side of the needle tip 112a.

  The catheter assembly 110 according to the second embodiment is basically configured as described above, and the operation and effect thereof will be described below.

  When using the catheter assembly 110, the user grasps the housing 114 and punctures the inner needle 112 and the tip of the catheter 116 from the patient's body surface into the blood vessel. In this puncture state, the user retracts the guide wire operating member 122 relative to the housing 114 in the proximal direction. By this operation, as shown in FIG. 16, the large-diameter portion 120 a of the guide wire 120 also moves in the proximal direction, and enters the inner portion of the first fixed-side passage 148. For this reason, the small diameter portion 120b of the guide wire 120 slides on the first fixed side passage 148, the movable side passage 170, the second fixed side passage 154, and the through hole 128, and the tip thereof is sent out from the needle tip 112a.

  After the guide wire 120 protrudes, the user grasps the catheter operation member 119 and pushes it out in the distal direction, thereby moving the catheter 116 and the catheter hub 118 relative to the housing 114 (including relative retraction of the housing 114). Let Thereby, the catheter 116 enters the inner part of the blood vessel along the guide wire 120, and the protector 124 extends in the axial direction as the catheter hub 118 advances.

  The catheter assembly 110 automatically retracts the distal end of the guide wire 120 in the proximal direction based on the advancement of the second relay cylinder 162. That is, as shown in FIG. 17, when the extending protrusion 166 of the second relay cylinder 162 advances in the distal direction, the distance between the needle holding portion 132 and the protector 124 becomes longer, and the guide wire 120 and It will reciprocate in the proximal direction. As a result, the distal end of the guide wire 120 in the free state moves in the proximal direction through the through-hole 128, moves backward from the needle tip 112 a of the inner needle 112 to the non-exposed state.

  The catheter assembly 110 accommodates the inner needle 112 inside the protector 124 by extension of the protector 124. At this time, the inner cylinder 156 advances in the distal direction from the housing 114, so that the pair of engagement arms 62 releases the engagement of the catheter hub 118, and the protector 124 and the catheter hub 118 are detached. When the inner cylinder 156 advances, the movable member 158 moves upward in the cavity 64 and is locked at a position facing the needle tip 112a of the inner needle 112, thereby preventing the inner needle 112 from being exposed. At this time, since the guide wire 120 is retracted to the proximal end side with respect to the needle tip 112a of the inner needle 112, the movable member 158 can be moved smoothly.

  As described above, the catheter assembly 110 according to the second embodiment can achieve the same effects as the catheter assembly 10 according to the first embodiment. The catheter assembly 110 is formed in a midline type, and has a configuration in which the guide wire 120 protrudes from the needle tip 112a as the guide wire operation member 122 is retracted. Thus, the user can easily advance the guide wire 120 in the vicinity of the distal end side holding the catheter assembly 110 during puncturing.

  In the above-described embodiment, the proximal end portions of the guide wires 20 and 120 are fixed to the guide wire operation members 22 and 122, but are not limited thereto. For example, in the catheter assemblies 10 and 110, the proximal ends of the guide wires 20 and 120 may be fixed to the inner needles 12 and 112, or may be fixed to the housings 14 and 114.

DESCRIPTION OF SYMBOLS 10, 110 ... Catheter assembly 12, 112 ... Inner needle 12a, 112a ... Needle tip 14, 114 ... Housing 16, 116 ... Catheter 18, 118 ... Catheter hub 20, 120 ... Guide wire 20a, 120a ... Large diameter part 20b, 120b ... small diameter portion 22,122 ... guide wire operation member 24,124 ... protector 88,170 ... movable side passage 90, 147 ... fixed side passage 92,148 ... first fixed side passage 94,154 ... second fixed side passage

Claims (10)

A catheter;
A catheter hub for fixing and holding the catheter;
A hollow inner needle having a needle tip and removably inserted into the catheter;
A needle hub for fixing and holding the inner needle;
A guide wire that is inserted into the inner needle and can move relative to the inner needle and protrude from the needle tip;
A guide wire operating member for operating the relative movement of the guide wire;
A retracting member that moves forward relative to the needle hub with the advancement of the catheter hub and moves the distal end of the guide wire to the proximal side of the needle tip based on the advancement operation. A catheter assembly. The catheter assembly of claim 1.
The retractable member is provided with a movable side guide portion on which the guide wire is movably disposed,
The inner needle or the needle hub is provided with a fixed guide portion on which the guide wire is movably disposed,
The guide wire retracts in the inner needle by the relative displacement of the movable guide portion and the guide wire as the retracting member advances. The catheter assembly according to claim 2,
The movable side guide portion and the fixed side guide portion are passages through which a guide wire can be inserted. The catheter assembly according to claim 3,
The passage of the movable side guide portion has an inlet port and an outlet port,
The inlet port and the outlet port are both oriented in the proximal direction. The catheter assembly of claim 3,
The movable side guide part and the fixed side guide part have ports that face each other and extend linearly along the moving direction of the retracting member. The catheter assembly according to any one of claims 2 to 5,
The fixed side guide part includes a first fixed side guide part and a second fixed side guide part independent of each other,
The guide wire protrudes from the guide wire operating member, and is inserted into the inner needle through the first fixed side guide part, the movable side guide part, and the second fixed side guide part in this order. A catheter assembly characterized by that. The catheter assembly according to any one of claims 1 to 6,
The guide wire includes a high-rigidity portion protruding from the guidewire operating member and having increased rigidity over a predetermined range, and a low-rigidity portion that extends continuously from the high-rigidity portion and has lower rigidity than the high-rigidity portion. A catheter assembly characterized by that. The catheter assembly according to any one of claims 1 to 7,
The catheter assembly according to claim 1, wherein the retracting member advances following the advancement of the catheter hub and constitutes at least a part of a protector that houses the inner needle therein. The catheter assembly according to claim 8.
The protector has a multiple structure in which a plurality of cylinders having different diameters are stacked at the time of puncturing the inner needle and the catheter, and the plurality of cylinders are stepped in the advancing direction of the catheter hub as the catheter hub advances. Is a configuration that stretches automatically,
The catheter assembly, wherein the retracting member is one of the plurality of cylindrical bodies. The catheter assembly according to any one of claims 1 to 9,
The catheter assembly is characterized in that the guide wire operating member projects the guide wire from the needle tip in accordance with a relative movement operation with respect to the needle hub.

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